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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773182353b54e34453552f9c5dfdf3e554a2c638f55a7d92cb56786ee936d5e8' 
  AND token = 'Z6dTGj2jaQxPdo/mJQvXHjm/zEDVI9+nQiUb1zQMcs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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