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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c1f889c8960e2d9a9f17e4fbee3a36edd45e7401c9300331b799dd88548dfd' 
  AND token = 'FBLhiBpgbumGDbQewrIOZYev02IiwrIC1ZLRVZqoNtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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