SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677013c4c9b5e42a2bd77afeec956234a6c8e5358671ce541aa51827f45426c6' 
  AND token = 'w1xMXSlVwNYooPqKrN9/JpbVScxnPFymVEZYzFdoOJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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