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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f489615681ed1f2c5461a2887eef8123da0e154476ff0b82f1f5c0e44aa1ba' 
  AND token = '6SNWR6daYZc0E0tlzOPcQcsoNXJbqNnLQWyK1vMs93Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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