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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237ead433cb7ef8a23d3dcc09a86105a1af8ce27e5e83ed5b0d377b91a6caa06' 
  AND token = 'FdeiLzlkfab1PUDMg+B14U4Cq4Y70eP7NwPL6o87/U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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