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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b93b0f87584c768e5bdeb266fe0f8cab915e9889793009b11b551d288b57078' 
  AND token = 'vWt8dsr/fLft7PIiErsNX5wdLf0ZTk2wJFvY1eNVkAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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