Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a9fc263b540c2d67fab9734962a0b28b50f723dfb03c36f401f64a74b9ec8c' 
  AND token = 'Pbtzq1VOYDceVVjLa5mTI3AdPoOpG50w3pN3xNml5E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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