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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e4b7adb7d4f28f7ce0ebd69a74a11e73b4f6d571347b54e0d7523e7e6ff60f' 
  AND token = '0qggUTJ6zVyvNIX6U9abJNVq8u7tajzTBjCk15MxnNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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