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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5a0252eea9d65cb104a11d1cd92412e1858300c013f7e3c02385a3b7baf5a4' 
  AND token = 'ReBtHhR78UVLSQ6tveP3MN5PHcTyVPiirzw1kuYlVyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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