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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24dbdf17d7bc3933d42d0bc5efa7f325ce5bcb70bdb8603225331beb36935516' 
  AND token = 'OUzYNklG/5FsdLn5Ceh3DPK6yj3rmV0Z0pvyjqQ3OeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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