SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4622bc3f10ab4f2a3c9c395882ae37f1f018af2958ca4b2cf3ab7ef71219d480' 
  AND token = 'QKfVXQ/BQLE/dmUmmAdqsFBp9t+y2hCxChXeN9U/z7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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