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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb790492cfb4cbb18b62de3201d83235d565fd7b4138580404fd38de6c8c306' 
  AND token = 'u9N2ZKzpej6OZDNqQeCzrAgQDVkZK9UiD6ywTGGS7kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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