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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9523424a807fd5995c3a5390228fe36fc3fbf2bae5fb33187a6642504bc56e0' 
  AND token = '3NjAx6KvNSelaGpEfq0M4K8muRA7VXrSdoaIFDDkv4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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