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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42b325b9896db8bb89fd1ea4061c078d7926dca16605c49dbd466af9d23ad53' 
  AND token = 'XDTngwMBVoGqo5PIPY6dSLGDE1iNJQ4sz6ZEFcE6FkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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