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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8568ce58804b238207cfae7fcb0e3fa96bc5ea625f813462f6c9bf8776c5cd6f' 
  AND token = '1bN0wOWhU3wezwDHUQzjqWADHS2lrHvUC2PRVQckGco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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