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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02e27526f96c4aeecc4b2d7fa665a035ea84ebac4dd36f6f17ba99a06d246ea' 
  AND token = 'MLOi3cdFqH8Y65iAt3vgQRTAZkjZEG2bLB7RhTdiEzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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