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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d824e1aeeeeb9b81e4cda73341bfe15a25cd3a89331a914afb19d551e6a39b' 
  AND token = '/VFEbGrbud0DHMVhb52qwgQ3K0dyD0C6wvgD3G3GraA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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