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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3947e3e2782030a7a8f41bfdd5017973a3247de89c97c9c528228d58c548977a' 
  AND token = 'a3lADZBho88p6+1bfiRv36ezRJUDygxKfF64pNJkvlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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