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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8796e17e9ca09ed7ed97eaefd249285327eb9e133eb479c729e04a8495b604e9' 
  AND token = 'WxZ4obZnKbaWaDRFPMr2vvMjGw73we7g6PlmadjlAjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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