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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511d5cd24f79e2f6387fdc2fb3ef209c35541180e09824aaa85de629f2251c6d' 
  AND token = '/8o46XjUg94eLKhP0Ih/yKFDVlk6SnWd6YqigDC9yLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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