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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e733f6c0a08173649dd51dcaa3394023e329176faae6871a4179eb3d4bbef3' 
  AND token = 'Gs5VXaFOoS0XAADZ5l0IsG4MMPT1/2w52ywNL/e41L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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