SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2950f056362d1f032844a1bcede3d9229f20472d2e0b5471abb40385b8ffd673' 
  AND token = 'Xsoi2zPwWYIle1GHGVVk+XX7pZjaE1VE6kVADYzvOWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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