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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ffd2d94ea19b884f520ac38c720e13eb0c007f2d4ea17185b6d9f8f8f3ba11' 
  AND token = '1mvpGdwFZyL1HTCEJX6a5QhXwwvCOFENhotp/WAw8X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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