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create table t1 (c1 int not null, c2 int, unique index(c1), index (c2)) engine=innodb; insert into t1 (c1, c2) select 1, round(rand()*100); insert into t1 (c1, c2) select (select max(c1) from t1) + c1, c1*93563%100 from t1; insert into t1 (c1, c2) select (select max(c1) from t1) + c1, c1*93563%100 from t1; insert into t1 (c1, c2) select (select max(c1) from t1) + c1, c1*93563%100 from t1; select count(*) from t1; count(*) 8 explain select * from t1 where c2 = 1 order by c1; id 1 select_type SIMPLE table t1 type ref possible_keys c2 key c2 key_len 5 ref const rows 1 Extra Using where; Using index drop table t1;