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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76160d59ec719d239e364dca5b0ffdbbef6ecf607a4c4af513fb4f1ca84b2f93' 
  AND token = 'yZmWzWqdkcGfH+KmPsdcTyO4nlnKBRHnQqK3Mjl7oWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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