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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc350fef9d532813ca7d1929ef17b12b334a487c57c365f3cb20d1fcfd7766b' 
  AND token = 'MKyn01QMUm9KmjHgLg0aaHeSC4qvxv7gk5RUdcF8D5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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