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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936b351972fe4e2769e21cdeb1b860dc575c567541f28b984cf6067112172c01' 
  AND token = '5fPFCUhrqED2ShGF9lfWudb18Bq29jdd6eM9xWRdl5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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