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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda56c57131142e182754fb9f80f389d6ff2c060bfcfaf64ac62419e2dd8921b' 
  AND token = 'tZGPS++bsF7LFntcjFa0vXMrMepkfPHORCy2dmo6DLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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