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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3821fa3ccb684b6fe4c2f7f23c93325f4cd9592b9256ef9f34f5f3e080fd7e' 
  AND token = 'fkXchY+Mqqe234GLOTqJGbb1ra5I8p502au875htXnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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