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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041fcd15073028eec8b421d90ae18d1e0b7f1c5f6d1c812d9a4c7007d10b6d8d' 
  AND token = 'kttFJvx6TBjAypd4FEmw0LOy8jgGR57MK27b+zLQBDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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