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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae588d2f71735e08209ea6c0cff7efd0d5fdc5ffb47c0d645256bb6d743620e3' 
  AND token = 'Bg4RehSFJBA1jrhrnAOAaGFQRon+KQE3by2oz9h3+9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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