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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401f2f291575916531ba295be81e812599bd607a0cb84d11e78e97038a729878' 
  AND token = '8LCExjpPlUR82MWgvf2Lbjkd8KEQ3srMFOr5mUxpXkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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