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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ada34970d625a07fcaa749922f2ea3f391a0ec43dc943dd63ec04352cdc4660' 
  AND token = 'Tg3j1Y4QBVpaA4r61yDF5R7EUZm71Q+DSVk6BG5MAbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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