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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d970450e592f2c06c288228a4f9d5a044a76bfd7c0ac2ab4cbac8d5b5b6cc8' 
  AND token = 'voCpHQ7IuQe/mYudl3hNht1WaJMiadtq3e5JLZqi4W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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