SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c60cd879c5b86367de393aa5635f36f7652047fd129946cea1937331ae4b2d' 
  AND token = 'wMvjvYq9eBQleX/vK08pRCAhgSjkpeX0T0dm6zYSbj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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