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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc47bc81eb1bdf15c0c40c26dd41dfef5b5c2a65a447fd03a9967b0c7b9d487' 
  AND token = 'UnF7PhXZ+7f/I2r5SAA8AnFQmWAV4O1CcJFKPaUAWZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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