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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16175f5665a49bdb807ac2c7f8558a3d0ed1655d6f8cc0a1938f02c97cc2d5b' 
  AND token = 'Qr2tLsS72NIXnFPOfDmGzrAjZDk5rWKZU4wnuSjxqMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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