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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5de8116ff9bfb8c907789739c515d7ce5c6845eae31a6af6d43c836127be2b5' 
  AND token = 'JKOu3AeUxAqbwvn0F80XHJasc5Y29Sjdp9GWG3jj3LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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