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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ef5033c5f097f9c35fb6708a83bad1637cc2f8da0a5d2e00dbd5b48d953d06' 
  AND token = 'xaatkNG30Wn4dQWiZCzsdBSaY72IPq3xDMKkgkO5JJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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