id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	category	NULL	ALL	NULL	NULL	NULL	NULL	69	10.00	Using where; Using temporary; Using filesort
1	SIMPLE	order_by	NULL	ALL	NULL	NULL	NULL	NULL	27	100.00	Using where; Using join buffer (Block Nested Loop)