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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16bca98d12f76f94e69ef99d584fbea6adfe42408d52c26d8cbb6366f4eacc2a' 
  AND token = 'x1WkEZBs54a7PBE3q+LHIu3LGECxAOKigzv9Tj68yz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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