SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fe214f3e2181a1bc7139525d33c7b4dfeb45786500d3db663d18a2df89a8cb' 
  AND token = '+OmFJXvmpRlWMxXf8NCSijBecQpWo3gnTVJT2GJPmZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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