SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc585d2a6db0c6e5e6004eec1cf7591c224b6abd89011b298b6eef9e42d5570' 
  AND token = 'Kw+DppvGMrl3AVqorZbNyh7VEbgN8bLB7H0zL2hLvBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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