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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96360b58314317466b7fc45d2f7d76f3975b4617c0bf0293c77371531261272' 
  AND token = '4qzspKGYHl4tX82B3rXeYycJHsK4vUSEUHZZZR0sz7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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