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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb48c77ce45d84320e3c4baf8ed5f9ee9e59b4af54001bf1242eabff6cdce51' 
  AND token = '+MsyBuMYBf6irLYMQl0ivDeVOaKSAXX/NsXLMlLJgyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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