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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a13e96cadebf4a46d241cc5c857c2dcd733aa514f94bd31e1e79d0cf461b37' 
  AND token = 'zzEV5F3YhVpNQwhriwXpJtthrnLshBA6pMdW/ip802w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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