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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298ceee3590886a1f36a622e6ba891abe9fcd9087aaa4e3b5ad284fd3fa96741' 
  AND token = 'ZGBzHkv2XNCHScz/E5d6RekVOL2ZVjcDwLNtrOR7BhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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