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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76b7dcfcbb3e00a08f52a8221fbb64631683976272d8f02f7b25dc1627db1fa' 
  AND token = 'ImqS01NCMQ4fl15HUWVhXDbEkBq0cAmyrsKs9c8VGis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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