Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702ffb638be312b8fa412a0860c191886b30d2c53e53aed6fca8dace24d265bb' 
  AND token = 'u75se7fg9RxK8Fzm/grd7hCaY32bJXes6w3tD7XAJwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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