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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b93b201383dece1fb27520d8d1559e3915269eebdd4de9327fa1080e2d143d' 
  AND token = 'uMUrMzaDP6DVT7nruiWQMF9yAVzpOfmy82A5N1qg/QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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