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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f364a7dfb9506a4cc53ae7107dffd09b4a99acc6a2c839538fc844513fdab60a' 
  AND token = 'yMGiAIshzOZa5oSq5K9uAm129RLe9rYFVgxoCO7+uuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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