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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40a971ef2d6baf0213def95f308f6aae3b8799f59ce404fbfbd27c90349678c' 
  AND token = 'VJm+jA7I98a+/BuOBNL9fH3dSGo6WV6yCVRhm/LV2No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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