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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b375c66ea3602b2396de6737c9122fc34b8f751c2f8e477466bc60e93e874ed' 
  AND token = 'guAX43UGBHlW1vnbCAtuGRVRDaWUWcgM0ZcgCV1yTnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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