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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6ceb3cc483c8265badcb4124cf882c96f7df7de9414c1a45007dfc6b1d08fc' 
  AND token = 'OuPOwL0hbsyQLhG7n4PDQAprTJVa3/1nKmtXYSYXmIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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