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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13de2b6d6e2bf83d36ee21521d464f0a878c859c4d12fc58d6586280fd7e6b8b' 
  AND token = 'PH0JlC5Eyvcmdu3gYm1YnpxAI9UKHjxUqMQvOxlcA6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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