SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86e1063f88d44da55cab813010c3c4e1c8911f56ea3522402855fdb56d2264f' 
  AND token = 'X0AM33tpbOCdnruD+8Qt02wixbq38ow05six4AokVv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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