SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7968ac4b4b26d6b80477c6925ca99ebdf6458fa6c56a29294d959a28072441f5' 
  AND token = 'ImhIsr/2mBRlkgD+TZjVClcLc1J9ZooDxjRxhnUHJJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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