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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad6fe92a740ded0ba65b1cf9dd409f703ed79a1d43388f86013b7b3383adfb5' 
  AND token = 'XzqyoaebBkiNs7ucZLtgCa3tvmvqHEh6nxGa22ZJqZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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