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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828e2c761fd242d8d134fcc3a1d2567fc1d26fe35e546944e28d5167e5d0ad15' 
  AND token = '2PLDMfW7b4v1g1lxoz7IY6K+kGjv7Q+WxRO/82F0AbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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