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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833f1fd850810d4951dbf33dda20b4dfdaefa1416ed9cae71ab27025f4a5b718' 
  AND token = 'yxk0wHjDzfUI8ehNj4PPdRqo6nE2aV8dzk4wNYEPKkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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