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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc9a1cd100a3b74513382b5b239c9361bec062520fbf8627f8dac0481bf2928' 
  AND token = 'gCCbc3vbWp0ZRXUMEGgbvO2bbfkCwcKRpm+h9cT2RJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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