SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca30436ae51ff773d80113cb8f8352acf9068d52310dc44f90db374ea31f3e9' 
  AND token = 'hmXnhvvNMQKXCKToBwGTpCoi23NqxWJeiA4aFJLzmt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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