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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f01758b599033c0e899e871d25fcbbb716559a6f488f4a790d9ee98613843b8' 
  AND token = 'yunn8Kh6Blm+Yqxgk54xqUXQIewRuN5YhUWNblNa6Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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