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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943a9e456f00ccfe964ade040c3083f9e40a2ad46d8281345a4f5a9ddcb921da' 
  AND token = '93qfVwRtA0qiVl3/kmkTdj0t4u8IVPJar7Y9kHMl5Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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