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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2399cd5cf55cbe41b78dfe81c84d42f36d55bc53db9970ff9a6ba564f28cba55' 
  AND token = 'SYa7Hy5iMUyl7bFubRPfWtWdYKdX0jkrz8Rwm9k969s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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