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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd66b92bf7ff541379dc4eef4d28e4f78c8d4a5187bea18094e9416ace2b86e' 
  AND token = 'BRunJXQhcL14OIUm8eR9BlnmV+J1sieikoDbsCpJ8bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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