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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9f4a077a16d68a8d50dac8841c4c095414db02e6e4cf56f02e773711f30ff5' 
  AND token = 'UwKYY0Cg5gFj1mZxBhtawDt06L9MOyV8Ha7CWrUQh2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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