SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87cbd27556626c4e145abcb346831f270916d9ca54847e388aaf86d9eac0bf6' 
  AND token = 'YDyWhJ4gwpLflw5Su1dx2lhZEU456ToRWH1KgO+wsjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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