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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7579893918fc22c7630ebd81b49ff105039589037d1bf3a8f193369bb42f17d2' 
  AND token = 'Uxe0XljnUAlQKtAgJS4xSJKy9Hp68nuq45ju2EIexVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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