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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204ea42c7980e3215e151e601aa4ab3c7fcdb71fc8abaea08c7f94a0f55ea8cb' 
  AND token = 'AJJAB097nwOZRHmrv0SkkWZLdCkWWKCQu4wie6c5yK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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