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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a92abaacfe88881d07e80ee2fa07d47b07a548a663e646c309e5fef433ada6d' 
  AND token = 'jJsG2ib920MT4q+tf7cVQRvcvciXSqstA7Q+QMQ4hJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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