SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb243e3b2215cf359c40d426fd73b81a6ff1ec4c5d6fcf23eed18645c585744d' 
  AND token = 'LZhMqPlAVBKPDIr4sajAn/RsQy+7+ezbD3XRqPno98Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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