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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c760337b10bf42b4b632c980b4954f11384950a3c531e29d9595580c09705d' 
  AND token = 'ShVWlzxZh8xNvIhBDcyi9jJtE4ddHl2rs9KSpZoczhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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