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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2960c3473f0ddf7a9810600abd8e81198d6a8a6cd7c988b9189a89cc9f4f29bd' 
  AND token = 'aBLNhu7xgBAxDHOK3/xc1j05aLHloaa/0V6VoDeaBe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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