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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e948be8ca035fe5c21149d6ef77a5376d9de82882f6bea66edadd37759935a5' 
  AND token = 'x3uNd1VOHmqgBps5Xl2S5WdSobV2o+jAcw05Kdtbpzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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