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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0a5304772a9d042fe6ece86c7cc53de50edb81ac0f5ba8f44da66fd5f5fe05' 
  AND token = 'ObXj/lnQpOgio/V/l724wOUn4mxrlofgpTzytRcBDuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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