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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8159c47718218446c0abc389da9b5612cb5e5cf377964bf26f0acae9ea31bf' 
  AND token = '8JUJ0KLKYL40JUeqGRBB7Uc4rKssW1WpKJsxRbiZEx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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