SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b132545926c5a3ddaf5a848e3550ea0f0bb2a48e29f6734afb861f13f7856df' 
  AND token = '6Scw/MlLFgShDp9E5sxv+4XaMJpPfviu/LHQtVTLw8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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