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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665dd433eb543676d06857512e7576df5490407e6da3c0937aed650ae5ed854e' 
  AND token = '2qUEKh+hmRjl14LYME6/dYGI/zaikBJpN3ba7xQmfRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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