SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b759aa5337593173e761462495e42fe5a19712e80efcba6de82baa0832ddebb8' 
  AND token = 'MRvX4G9hgCz13tlu8nI+KuiIJOZHqwV4XOEERNs5lCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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