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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d6e9cdeeb6d846d52f8bc23648eff72cc64d80f1142d5210b41fc08f2f656f' 
  AND token = 'etyZTPZiEcTHzBGFcCSBb3+P8bQGbhBgl3/tHlvyLWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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