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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40552e9fed04e95ca1cca152e7cd85de8de75c8f9c569df692cdfe50ffe9af1' 
  AND token = 'PAFS+LXTa5OluAOm3XbhTPIYafMbTTlkZxthG9pL8ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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