Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0cd432941f537ce8069ac012ae68ba4778d5e0ee9e3266f289a0c75635f371' 
  AND token = 'Pd3T7WPj1svWKJYNYg3eqIroQDpEuKL/OwJeWEsEoXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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