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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6d326c9397d2b1179bcce5abf1f9a3e4f96ba82ab17adb844d593de00cb750' 
  AND token = 'TaL+DRlxoL70aAhx4V1MY+L6dIYJwKaBGm5kvoocnWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00763

JSON explain

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