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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c553e1b2102b3be2396716a4679cd916e39e3fc234c6c58a98fa11a83e80b7f0' 
  AND token = 'WLR7Z8qCrJOqhXsABuCtJ31E05mI6J3NwLgs7ALDrRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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