mysql - インデックスも作成した後、クエリはフルスキャンを実行しています

Question

私のクエリは全テーブル スキャンを実行しています。

mysql> explain select dr.* from iflora_delivery_rules dr where dr.order_end_date >= "2013-05-01 09:28:05" and dr.deactive_date is null and ( (brand_id = 1 and dr.source_code in ( '1.1.1.1' , '1.1.1' , '1.1' , '1' )) or (brand_id = 0 and dr.source_code in ( '1.1.1.1' , '1.1.1' , '1.1' , '1' ))) order by precedence desc,brand_id desc,source_code desc;
+----+-------------+-------+------+---------------+------+---------+------+------+-----------------------------+
| id | select_type | table | type | possible_keys | key  | key_len | ref  | rows | Extra                       |
+----+-------------+-------+------+---------------+------+---------+------+------+-----------------------------+
|  1 | SIMPLE      | dr    | ALL  | NULL          | NULL | NULL    | NULL |  867 | Using where; Using filesort |
+----+-------------+-------+------+---------------+------+---------+------+------+-----------------------------+
1 row in set (0.00 sec)

列 brand_id,source_code にインデックスを作成しました

mysql> create index idx_brand_n1 on iflora_delivery_rules(brand_id);
Query OK, 0 rows affected (0.08 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql>  create index idx_source_code_n1 on iflora_delivery_rules(source_code);
Query OK, 0 rows affected (0.09 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> explain select dr.* from iflora_delivery_rules dr where dr.order_end_date >= "2013-05-01 09:28:05" and dr.deactive_date is null and ( (brand_id = 1 and dr.source_code in ( '1.1.1.1' , '1.1.1' , '1.1' , '1' )) or (brand_id = 0 and dr.source_code in ( '1.1.1.1' , '1.1.1' , '1.1' , '1' ))) order by precedence desc,brand_id desc,source_code desc;
+----+-------------+-------+------+---------------------------------+------+---------+------+------+-----------------------------+
| id | select_type | table | type | possible_keys                   | key  | key_len | ref  | rows | Extra                       |
+----+-------------+-------+------+---------------------------------+------+---------+------+------+-----------------------------+
|  1 | SIMPLE      | dr    | ALL  | idx_brand_n1,idx_source_code_n1 | NULL | NULL    | NULL |  867 | Using where; Using filesort |
+----+-------------+-------+------+---------------------------------+------+---------+------+------+-----------------------------+
1 row in set (0.00 sec)

テーブル

mysql> show create table iflora_delivery_rules\G
*************************** 1. row ***************************
       Table: iflora_delivery_rules
Create Table: CREATE TABLE `iflora_delivery_rules` (
  `row_mod` datetime DEFAULT NULL,
  `row_create` datetime DEFAULT NULL,
  `delivery_rule_id` int(11) NOT NULL,
  `source_code` varchar(20) COLLATE latin1_bin DEFAULT NULL,
  `rotation_weight` int(11) DEFAULT NULL,
  `order_start_date` datetime DEFAULT NULL,
  `order_end_date` datetime DEFAULT NULL,
  `order_day_of_week` varchar(7) COLLATE latin1_bin DEFAULT NULL,
  `delivery_start_date` datetime DEFAULT NULL,
  `delivery_end_date` datetime DEFAULT NULL,
  `delivery_day_of_week` varchar(7) COLLATE latin1_bin DEFAULT NULL,
  `charge_type` varchar(50) COLLATE latin1_bin NOT NULL,
  `lead_min_days` int(11) NOT NULL,
  `lead_max_days` int(11) NOT NULL,
  `precedence` decimal(12,4) NOT NULL,
  `charge_name` varchar(255) COLLATE latin1_bin DEFAULT NULL,
  `amount` decimal(8,2) NOT NULL,
  `display_colour` varchar(50) COLLATE latin1_bin DEFAULT NULL,
  `display_long_desc` varchar(100) COLLATE latin1_bin DEFAULT NULL,
  `display_short_desc` varchar(50) COLLATE latin1_bin DEFAULT NULL,
  `exec_country_type` varchar(5) COLLATE latin1_bin NOT NULL,
  `shipping_method_id` int(11) DEFAULT NULL,
  `rule_line_id` varchar(20) COLLATE latin1_bin NOT NULL,
  `deactive_date` datetime DEFAULT NULL,
  `version_id` int(11) DEFAULT NULL,
  `delivery_rule_type` varchar(5) COLLATE latin1_bin DEFAULT NULL,
  `brand_id` int(11) DEFAULT NULL,
  KEY `iflora_delivery_rules_n1` (`shipping_method_id`),
  KEY `idx_exec_country_type_n1` (`exec_country_type`),
  KEY `idx_rotation_weight_n1` (`rotation_weight`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_bin
1 row in set (0.00 sec)