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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68e284f5c06b6dd173dfc6d52a2f9f2a9462fbf747e467d34299655b83b8979' 
  AND token = 'vc741cZLBo1Moo+tIQEf5f4yos1ySXbOcM0BiUvIJsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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