请教各位，小弟在每天排查MYSQL慢日志的过程中，经常出现不该慢的SQL，也出现在慢日志里了。不该出现的原因是通过explain查看执行计划，type=ref，有些甚至是const的。通过观察zabbix监控，发现系统负载当时也是比较稳定的。
请问下这种情况下该如何排查？
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