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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf992d9994ae9285bb9736f5b1aca0dc1ba677c92b0cbe42f5733058350b039d' 
  AND token = 'lOjQMWshvqlaN9Ao6RozPNO8vbIWaPMJXci7AxWkXU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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