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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30516ea63f828b50b0941e13faf6ca1c501cc5e7ca01ab27ba3cf94e40e21489' 
  AND token = 'Y17Aq0nr1EHipoUMMkflI3AmtXxy7yp73DXeKwOA/mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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