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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4fc5cd57dbcd4fcc3ca9c1e49a58849f3aaa4b72238be707a252decaa0d671' 
  AND token = '3sNZsCc5jm3C005MUxNif+pSaJeWOP4xW9zAQHZD8es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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