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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128358f32922126a5e2aa9d11675d17e5569e589d07e1a820b250d8aa3d8154d' 
  AND token = 'RLfdPhUYGeXe6gKQO8w3ZdoU8BSoKV/IJTAxFLcalYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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