SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5904c1486c15983a8d2d64fb60ba88af3732e76b637e92851e4c128467eb1cfe' 
  AND token = 'w3+tYTHO7mYy7JG5kwb+gnu1W0qiRCFx/zHA1yqPYzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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