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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70584bc2e4fd64a4de21079e1ee3275c8ee4359197911fe60aa89fd6e0cce374' 
  AND token = 'V2UlqMf1FYW+mki4o/IIUXir46rUll7EZ6tTW/cL6I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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