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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68c973ef1da79c9f9441e7450999396814f184cc1f325eca05b843dabf640e5' 
  AND token = '9K8XSIAmPTVc+ai/V9hl/sU3PdODJXEd+zmNXrXr7nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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