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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417ab325f3eda3f514e2b019ab17b869c7b0128eaad83b18740aa5060ff37cf4' 
  AND token = '9doRskvBp1cjXz3ms4G62RqhIHJeQa9H3fxnpxqqzgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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