SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc89aaa594c6d2cc91ad8b01d33ff03855015132f4df893210b8a3a2d1a1672' 
  AND token = '7ZEZXHK6qXZjTBSP9Va+GZgeBeqchHCCNWEMBvVUtiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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