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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fecf987ffb925662a3f1e3372f0ca3e2b17b6167935ef5d9b43bffbefbf6407' 
  AND token = '28NQ6BrxD0kUj1G9de8Ng284B3+eYW0drVuKEi9reHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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