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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004c14467aee98f2db95a1a3c7c3e1ccbe5590c79373a025f0cef5d6e39e8c10' 
  AND token = 'FIeBifzmUi5P1QvK6o2bDoEKAqhvwknZPuxOUuEwb28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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