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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6371181d8e4af5116d7af6fa30b997e9f500c92a1954d552157744a5972453c' 
  AND token = 'tYUONvUzqprq9N6NoLqb2djfl3vhlMzyitKYs0jSrOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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