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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4130364fd618ecb06f113f35f64f36aca43a7ce769845ba146d9b84e07fd391e' 
  AND token = 'ovEY3Qot41xo+ibwlvWFhwJmjLMbimDqU6iT2vk76Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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