SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba0f92d40e1c9c5d4038ec07d06a74ac87b52451bef5a8668f8acc2ed14bf3f' 
  AND token = 'BoEBLGptJbOVtpUP3Pa9lJqz1AfmwQ1EAvx+rNgRdMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}