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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5545d7fd1fb039dac8338c2f7618f789fda9d53f6327e0cb4ad87acb36b0a31d' 
  AND token = '9a6PhMEY0k2rt5TIr2yqUCO/BbuCwpMv7pCD+gbWxJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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