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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31786b41dc1f52e290a4eb8fa6c25b1184f866ce92b94978f94f4777398c975' 
  AND token = '2BnHv3AlUpCFaSmuXERxBGzAUN4tQ7g7PcvwBi5wADk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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