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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d37dd7d63e8ea2844e6fa9d40b7478f0bca678c46743f30aec83c4082e3e70' 
  AND token = 'a/ame2F/+JwuaQj6AN+FLuFe1ODYHuNW/AQcVycO0e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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