SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07893a9a66c5a6c747a5073af6d225978b4afa994b98577e92ccc818314c27e' 
  AND token = 'Quvygz0JPQvhi28+/dhsKX0x0LYKKFEKyZ8sBhGnVnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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