Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ffa4736d7c8130888cbdf39705df83be0c491107d415b0450404f3608d075da' 
  AND token = 'QpAccpuktppgkFvgOIXBDl9v4Urh0pAsVBnqZmtNg+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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