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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae75d16430b050b647468bacafd94d44d5156188bcfc094e0eebb330f45f751' 
  AND token = '0Dr1hP3G8nhG52xp+yEpxQhAIjdPSPXd8yC5O93FbgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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