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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d82605a3567eb3c505b7c4cd1e882a59d30c6f6d07eb5f4d3b5649a8a28ee6f' 
  AND token = '8klFSNE3uQFrKZrmWKa80PtHJTpqvSl8FUete5YkTtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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