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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f46eb57f3c0a3df1123661ef78362c8083418c60823751ab7c029d2de7cdccd' 
  AND token = 'P+SgNU96x7p43oLgnUwjlISHU6wx8Mqp+r6+OajhpRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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