SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b2c0d9007576bbd813137eed6d8bbc9fc49683500f63885b3405b8ac2bc5fd' 
  AND token = 'qY0rMdV2keYMUG/+mxdPJnnlCwSgLtPILZsksu0m5Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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