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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95572bd21115507c712ce1449275468769168c39d9d6263a5b8825903aab0af6' 
  AND token = 'js5fM7DP2pkCeyKNXY1FYbONUF04XBWy7hSiBA7ysYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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