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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abae350db0ed00fa18e2a67855d26a4636d54e8fb44f93d7a508b6793534e243' 
  AND token = 'TJI9X3K0OW893GAMHhuYOGiMN/tbimigvnj4HQbbsMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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