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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a66f539b02319803db79ae9f6da852eb6c15851ca074d662714ba32c9582c6' 
  AND token = 'CdyxX2/oN6XyECoVaQXX4o+Z9pXn436iOdrB/8NxWUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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