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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9612102eb683c77c99225a4645d50d4cd813ce3161bd240cbe37ec92ad16c0ff' 
  AND token = '3Ii3UkiJf1FmDW2jMT7RhBoUIkunR2Hqn6Yv3yaY1GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}