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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7914e9ef473d101c2f08dd733a40c48c343dbe5ae4ee4afaf4bc8af300ec759b' 
  AND token = 'IhD1pzTVsLdKpVaCMSAzHWSGZd3iX5i6KmkptzYPhnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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