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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c31a43f758177ad3596736464839fbee970fc4ee48b5ab236dab0d92594e290' 
  AND token = 'TsIWXiz7k5rZ1m4GA2NBPLBsqkbkh0Iyhm19ZB5j86U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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