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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2d495f66abe0a065b66bf2c3d8c19e2d5fbedb74f75420c358960c44e4a185' 
  AND token = 'wjhK4wFnN5k7zBoBGZk3nx1DZ74rhHCJd41MBRO3xOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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