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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0034470e6feb5878d349580573389e1cd8d0eda6d5f053ddc80e8f6935f181df' 
  AND token = 'Ns8EuIF3bozoOTQFYz9G2lh4ZwSFfrkCF5zMgzj3U34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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