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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595a57dd3a67d9b1f0aab09e5ba279a0d9a73ab09280b5be3cbc84557904368f' 
  AND token = 'F5TKXSvRTkBgJ2oYlBrWe/2AYrodpU22wCI/VNYkq4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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