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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215cd80bb1bb8f566f7e589d9b8b8443bc00acbbf5e343fa18a919d7253e692a' 
  AND token = '1tGvLKy05jKr95AUAWurQMR3eqdpjU2/Y8LTQxK7JPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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