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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e52592c7d24e3bf14648eb654bc696cabc1a5caf822f2e48d3234a6ca99000d' 
  AND token = 'jsMhy8r4tBd4frXwDmgfemTRW4LDzl2WY1XHbwXyDhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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