Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b15e013ceef0a1d0f2a77074c676506ffb5ca296aade9e3281f24080df7eff2' 
  AND token = 'yvDCSZkvFvXvKM1eR+RlvvYpRYIC/FYCpNejrT6WO48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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