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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45d609f79253bd39a0e4ff28acddaaba7a07c893dc13902ddbb85c5d35f38fd' 
  AND token = 'QbriJVZnc6IqS7Hb73ahiKGB7wVpu8ELtVY265WXzx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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