SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd4c2e503628b55765c2ddae125998ce37684290bf5c22489960c22afe16429' 
  AND token = 'sSBq53uLF3wpB7pMgQ+PdS+a9r8rs6zJbYT4hphvjXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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