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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf73fd6b62aba450e63f98e227897eb448a142d3036b1f6c9316c661e96510af' 
  AND token = 'VXiGWU724t/Kjc2fY+UzBOZ9u6ZeLC6tseETLxN7N+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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