SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b51444bb229e7845aaa3d935cf0e742659b2b3c0edd6ce1f5c88325ec166c1' 
  AND token = 'GHWAdBW34k/PwiZK6YOxp+28k2u011J+Wg09hRDCYzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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