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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee8f1c757dae61b91ec37574802c7b1edeb7b9c9864cd99ee7bf76a4b1a9489' 
  AND token = '0u7zrjPtHkQaEShrJbxuLRGGY6oFUeLrCtdDky4F9zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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