SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23b85981c84a73272fdb57cebd535cee0fc956484ddf873bba84929393af35f' 
  AND token = 'hvHkj2qOOZmzyv4qTpUEpvHy/9CJEsjHAq+Q8UckpnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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