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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83245636c5692baf090b3e8c19954c28b5fcd5ae6e5e65e84c264f6351c7506b' 
  AND token = 'Es0Hyq06JNTazfHa7seo1KiICplYWZtdxXFDRkzQ/dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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