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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf94dec04f2b8f8d0ff2b768f2ccac598080727d051165c759aa71892186eab9' 
  AND token = 'A0M8RyDT/9tFuW5E5UZUeTGSme0AOJtJcBRxioPuTlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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