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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ed7a85b29bac0312dad25c02f1e3ef22b2acd4cffb0e69e3cfbb4c59a34c36' 
  AND token = '9fZx/qS8WdUmKP6r+EeHU30XPY9Zd2cYJnh4hL46dKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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