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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34753e74f01f6eb6083d3b4ca71532fa9e0d88388270dbb1a66df6ceafad21d' 
  AND token = 'C0/eWXvg6No3HMVVAgKbu6mR/0lQ3ILVdavBn5dTZQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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