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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0ee92511d70d511869a8e5ecd733ea0f574a4bd1b8cf5b9f542c8c581c8344' 
  AND token = '633JvwuFhHCKGry1hjb14znLJqEV971pL2HR7VsalcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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