SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cc0637af5a89b632caadf6b191021435e6b678447b09a68a2548f2e270542b' 
  AND token = 'zbo0mK//MWYqEKvtqY2JjE/d9zdL92WbmfmqwyX+OM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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