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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dfd0de20e2de4882a2f481123abc12ca10c2344c9484b889c832824cdcbf08' 
  AND token = 'afpd0X3My9obxG//UkAM9w9JTkhi6qK9WlXkXyygVoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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